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**Figure 1:**
Parallel computing scheme.

**Figure 2:**
Model of a tunnel.

**Figure 3:**
Mesh of a tunnel.

**Figure 4:**
Time vs number of CPUs (left - small mesh, right - large mesh).

**Figure 5:**
Speedup vs number of CPUs (left - small mesh, right - large mesh).

**Figure 6:**
Speedups and real times for 1-8 processors.

**Figure 7:**
Specimen geometry.

**Figure 8:**
Results for Three-point bending test: (a) Win NT cluster, (b)
Linux cluster, and (c) IBM SP2 machine.

**Figure 9:**
Elapsed time for Schur complement ordering.

**Figure 10:**
Elapsed time for optimal ordering.

**Figure 11:**
Speedup for Schur complement ordering.

**Figure 12:**
Speedup for optimal ordering.

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*Daniel Rypl *

2005-12-03